3 checking the use of repeaters, Repeater, Checking the use of repeaters – Lenze E94AYCCA User Manual
Page 30: E94aycca communication manual (canopen®)
E94AYCCA communication manual (CANopen®)
Installation
Electrical installation
30
L
EDS94AYCCA EN 5.0 - 06/2012
5.2.3.3
Checking the use of repeaters
Compare the values derived from tables
and
.
If the sum of the segment cable lengths is smaller than the total cable length to be
implemented, either repeaters must be used or the cable cross-section must be
increased.
If the use of repeaters reduces the max. possible total cable length so much that it is
smaller than the total cable length to be implemented, then the cable cross-section
must be increased or less repeaters must be used or the baud rate must be decreased.
The use of a further repeater is recommended as ...
– service interface
Advantage: trouble-free connection during bus operation is possible.
– calibration interface
Advantage: the calibration/programming unit remains electrically isolated.
Example
Given
Total cable length to be
implemented
450 m
Number of nodes
32
Cable cross-section
0.50 mm
2
(AWG 20)
Baud rate
125 kbps
Repeater used
Lenze repeater EMF2176IB
Reduction of the max. total cable
length per repeater (EMF2176IB)
30 m
Results
Max. possible total cable length
600 m
(see table
)
Max. segment cable length
360 m
(see table
)
Comparison
The max. segment cable length is smaller than the total cable length to be
implemented.
Conclusion
A repeater must be installed at the determined max. segment cable length
of 360 m.
Results with 1 repeater
Max. possible total cable length
570 m
(Reduction of the
by 30 m)
Sum of the segment cable lengths
720 m
Comparison
Both the possible total cable length and the segment cable lengths are larger
than the total cable length to be implemented.
Conclusion
1 repeater is sufficient to implement the total cable length of 450 m.